|Publication number||US7123209 B1|
|Application number||US 10/376,109|
|Publication date||Oct 17, 2006|
|Filing date||Feb 26, 2003|
|Priority date||Feb 26, 2003|
|Publication number||10376109, 376109, US 7123209 B1, US 7123209B1, US-B1-7123209, US7123209 B1, US7123209B1|
|Inventors||Laurent Desclos, Gregory Poilasne, Sebastian Rowson|
|Original Assignee||Ethertronics, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (45), Non-Patent Citations (2), Referenced by (10), Classifications (9), Legal Events (7)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This application relates to co-pending application Ser. No. 09/892,928, filed on Jun. 26, 2001, entitled “Multi Frequency Magnetic Dipole Antenna Structure and Methods Reusing the Volume of an Antenna” by L. Desclos et al., owned by the assignee of this application and incorporated herein by reference.
This application relates to co-pending application Ser. No. 10/076,922, entitled “Multi Frequency Magnetic Dipole Antenna Structures with a New E-Field Distribution for Very Low-Profile Antenna Applications” by G. Poilasne et at., owned by the assignee of this application and incorporated herein by reference.
This application relates to co-pending application Ser. No. 10/160,811, entitled “Multi-Band, Low-Profile, Capacitively Loaded Antennas with Integrated Filters” by J. Shamblin et al., owned by the assignee of this application and incorporated herein by reference.
1. Field of the Invention
The present invention relates generally to the field of wireless communications, and particularly to the design of antennas with differential inputs and outputs.
Certain wireless communications applications, such as those using Bluetooth and other ISM (Industrial Scientific and Medical) bands, use chipsets with differential inputs and outputs. Typically, antennas are only single-ended with a ground reference. When used together, the aforementioned antennas and chipsets are not fully compatible because the chipsets include a balanced line (one that has two conductors with equal currents in opposite directions) and the antennas an unbalanced line (one that has just one conductor and a ground).
To get around this incompatibility, baluns are often included in the design. A balun is a device that joins a balanced line to an unbalanced line. A balun is essentially a type of transformer that is used to convert an unbalanced signal to a balanced one or vice versa. Baluns isolate a transmission line and provide a balanced output.
In the case of multi-band applications, classical solutions are problematic because they require that multiple antennas be dedicated to meet the requirements of the targeted application. Especially in the case of mobile communications devices, where space is at a premium, this can be a serious hurdle to implementation. It can also be costly, because the construction of a balun is expensive, and can cost well more than the antenna itself—and at least several times the cost of capacitors.
The subject of this invention is an antenna with differential inputs and outputs that can be compatible with chipsets used in applications such as Bluetooth and ISM. Advantages of such a solution include efficiency, which is achieved by extraction of more gain from the chipset.
The present invention allows for multiple antenna elements in myriad physical configurations to cover one to n number of frequencies or bands of frequencies. At the same time, this invention allows for a differential input/output that can be connected to a differential amplifier.
Antenna elements according to the present invention can include both inductive and capacitive parts. Each element can provide a single frequency or band of frequency. The physical design of each element can vary, but generally allows for multiple frequencies by reusing the same design of a single element in multiple.
In one embodiment, a single element has two top plates and a bottom plate. In another embodiment a single element has one unshaped top plate and one bottom plate. In these embodiments, the elements can produce a specific frequency or band of frequency based on their relative size and shape. Different physical configurations can also be considered to adapt the antenna and its elements to the physical environment specific to a particular application. The plates are generally connected to ground and two independent plates can be connected to feeding points.
Once metal pieces have been cut and folded into a desired antenna element form for the purpose of matching a frequency or frequency band, they can then be arranged to target multiple bands. In one embodiment, the elements can be placed one next to the other. In another embodiment, the elements can be stacked, one on top of another. In yet another embodiment, the elements can be inserted one inside the other. Once the multiple elements have been arranged to both meet the frequency and space requirements of the specific application, a multi-frequency, multi-band, capacitively loaded magnetic dipole is produced.
In the proposed solution, a single antenna can cover several frequency bands, as well as a chipset differential configuration. These designs will reduce the overall cost of the system as well as save space and improve efficiency.
This summary does not purport to define the invention. The invention is defined by the claims.
In the following description, for purposes of explanation and not limitation, specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known methods and devices are omitted so as to not obscure the description of the present invention with unnecessary detail.
As described above, the baluns 14, 24 are necessary in order to convert the antenna input 10 into differential inputs 16 and 18 and the differential outputs 20 and 22 into an antenna output 26 Thus, through baluns 14 and 24, the differential amplifier circuits 12 and 18 can be connected to signal-ended antennas (not shown in
For example, as shown in
While embodiments and implementations of the invention have been shown and described, it should be apparent that many more embodiments and implementations are within the scope of the invention. Accordingly, the invention is not to be restricted, except in light of the claims and their equivalents.
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|U.S. Classification||343/860, 343/850|
|Cooperative Classification||H01Q1/38, H01Q21/30, H01Q9/30|
|European Classification||H01Q1/38, H01Q21/30, H01Q9/30|
|Feb 26, 2003||AS||Assignment|
Owner name: ETHERTRONICS, INC., CALIFORNIA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:DESCLOS, LAURENT;POILASNE, GREGORY;ROWSON, SEBASTIAN;REEL/FRAME:013836/0826
Effective date: 20030220
|Sep 11, 2008||AS||Assignment|
Owner name: SILICON VALLEY BANK,CALIFORNIA
Free format text: SECURITY AGREEMENT;ASSIGNOR:ETHERTRONICS, INC.;REEL/FRAME:021511/0303
Effective date: 20080911
|May 24, 2010||REMI||Maintenance fee reminder mailed|
|Oct 17, 2010||FPAY||Fee payment|
Year of fee payment: 4
|Oct 17, 2010||SULP||Surcharge for late payment|
|Mar 29, 2013||AS||Assignment|
Owner name: SILICON VALLY BANK, CALIFORNIA
Free format text: SECURITY AGREEMENT;ASSIGNOR:ETHERTRONICS, INC.;REEL/FRAME:030112/0223
Effective date: 20130329
Owner name: GOLD HILL CAPITAL 2008, LP, CALIFORNIA
Free format text: SECURITY AGREEMENT;ASSIGNOR:ETHERTRONICS, INC.;REEL/FRAME:030112/0223
Effective date: 20130329
|Feb 9, 2014||FPAY||Fee payment|
Year of fee payment: 8